@aral Take a look at To me this says that nic.at must cancel your domain in the absence of you wanting it renewed.

Resolution of Disputes Under this Agreement . Disputes arising under or in connection with this Agreement, including (1) disputes arising from ICANN 's failure to renew Registrar's accreditation and (2) requests for specific performance, shall be resolved in a court of competent jurisdiction or, at the election of either party, by an arbitration conducted as provided in this Subsection 5.6 pursuant to the International Arbitration Rules of the American Arbitration Association ("AAA"). The arbitration shall be conducted in English and shall occur in Los Angeles County, California, USA. There shall be three (3) arbitrators: each party shall choose one (1) arbitrator and, if those two (2) arbitrators do not agree on a third arbitrator, the third shall be chosen by the AAA. The parties shall bear the costs of the arbitration in equal shares, subject to the right of the arbitra...